Laura So, you suggest another rebelling by telling parents she is not doing it and not going to.
If she's not virgin anymore,and they take care to protect them,it isn't a big misbehaving,especially knowing they won't be able to do it again soon,and want to feel a bit each other...And better to know if they match well sexually before getting married;if not,they can work on it and enjoy more their wedding night.
Laura As soon as a potential BF is around.
Even before the first date or first kiss?